Setting detailed/customer error messages issues, iis7 asp classic

Question

I haven\'t been able to find a similar problem anywhere. Basically when I set the site to custom errors it displays the default 500 error message, however when I then set it to

Answer 1

By default IIS7 intercepts HTTP status codes such as 4xx and 5xx generated by applications further up the pipeline.

In web.config replace the line

with